[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.09.02"]
[Round "13"]
[White "Cools, Gorik"]
[Black "Lasar, Yves"]
[Result "1-0"]
[ECO "C02"]
[PlyCount "87"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. a3 c4 7. g3 Bd7 8. Bh3 Na5 9. Nbd2 Ne7 10. 0-0 h6 11. Ne1 0-0-0 12. Ng2 g6 13. Ne3 h5 14. b4 cxb3 15. Bb2 Bb5 16. c4 Nxc4 17. Rc1 Kb8 18. Ndxc4 dxc4 19. Nxc4 Bxc4 20. Rxc4 Nc6 21. Qf3 Rd7 22. Qf6 Rh7 23. Rfc1 Bh6 24. Rd1 Bg7 25. Qf3 Rh8 26. Rd3 Na5 27. Rc1 Rhd8 28. d5 Rxd5 29. Rxd5 exd5 30. Qxf7 Bf8 31. e6 Nc4 32. e7 Bxe7 33. Qxe7 Nxb2 34. Qe5+ Ka8 35. Qxb2 d4 36. Bf1 a5 37. Bd3 Ka7 38. Rb1 Rc8 39. Qxb3 Rc1+ 40. Kg2 Qc6+ 41. f3 Rc3 42. Qd1 Qd6 43. a4 b6 44. Rb3 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.31"]
[Round "12"]
[White "Agdestein, Simen"]
[Black "Lasar, Yves"]
[Result "1/2-1/2"]
[ECO "E11"]
[PlyCount "91"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Bd2 Bxd2+ 5. Nbxd2 d5 6. g3 b6 7. Bg2 Bb7 8. 0-0 0-0 9. cxd5 exd5 10. Ne5 Nbd7 11. Ndf3 Re8 12. Rc1 Nxe5 13. Nxe5 Qd6 14. Nd3 Re7 15. Re1 Rae8 16. Qa4 a5 17. Qb5 Nd7 18. e3 Ra8 19. Rc3 Nf6 20. Nf4 Ne4 21. Rc2 g5 22. Nh3 h6 23. f3 Nf6 24. Nf2 Rae8 25. Rce2 Bc6 26. Qd3 Qb4 27. a3 Qb5 28. Qf5 Kg7 29. Qc2 Bb7 30. Nd3 Qd7 31. Ne5 Qd6 32. Kf2 Nd7 33. Nxd7 Qxd7 34. h4 f6 35. g4 Ba6 36. Rd2 gxh4 37. Qc3 Qd6 38. f4 Qe6 39. Bf3 Bc4 40. e4 dxe4 41. Rxe4 Qf7 42. Rxe7 Qxe7 43. Rd1 Bd5 44. Rc1 c6 45. Rd1 b5 46. Qd3 1/2-1/2

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.30"]
[Round "11"]
[White "Lasar, Yves"]
[Black "Bernal Moro, Luis Javier"]
[Result "1-0"]
[ECO "D87"]
[PlyCount "81"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Bc4 Bg7 8. Ne2 0-0 9. 0-0 Nd7 10. Be3 Qc7 11. Rc1 b6 12. f3 Bb7 13. Bg5 Nf6 14. Qb3 e6 15. Rfd1 Rfe8 16. a4 h6 17. Bf4 Qe7 18. Be5 Nd7 19. Bg3 Rac8 20. a5 h5 21. h3 Bh6 22. Rc2 h4 23. Bh2 cxd4 24. cxd4 Red8 25. Rc3 Ba8 26. a6 Qf6 27. Bb5 Rxc3 28. Qxc3 Nc5 29. Bc7 Nxe4 30. fxe4 Rc8 31. Be5 Rxc3 32. Bxf6 Rb3 33. Bc4 Rb4 34. Bd3 Be3+ 35. Kf1 Bc6 36. Be5 Ba4 37. Ra1 f5 38. Bd6 Bxd4 39. Rc1 Bc5 40. Bxc5 bxc5 41. exf5 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.29"]
[Round "10"]
[White "Lasar, Yves"]
[Black "Font, Joaquim"]
[Result "0-1"]
[ECO "A44"]
[PlyCount "64"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 c5 2. d5 e5 3. c4 d6 4. e4 g6 5. Nc3 Bg7 6. Bd3 Ne7 7. Nge2 0-0 8. 0-0 Nd7 9. h3 f5 10. f4 a6 11. Qc2 exf4 12. Nxf4 Ne5 13. Be2 fxe4 14. Nxe4 Nf5 15. Qd1 Nd4 16. Be3 Nxe2+ 17. Qxe2 b5 18. b3 Re8 19. Rac1 Nxc4 20. bxc4 Rxe4 21. Rf3 Qe7 22. Kh1 Bd4 23. Re1 Bd7 24. g4 Bxe3 25. Rxe3 Rxe3 26. Qxe3 Qxe3 27. Rxe3 bxc4 28. Ne2 Re8 29. Rxe8+ Bxe8 30. Kg2 g5 31. Kf3 Kg7 32. Nc3 Bg6 0-1

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.27"]
[Round "9"]
[White "Lasar, Yves"]
[Black "Waqar, Mohamed"]
[Result "1-0"]
[ECO "E43"]
[PlyCount "85"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nc3 Bb4 4. e3 c5 5. Bd3 b6 6. Nf3 Bb7 7. 0-0 0-0 8. a3 Ba5 9. Na2 Qe7 10. Rb1 b5 11. dxc5 bxc4 12. Bxc4 Qxc5 13. Bd3 Bc7 14. Nc3 Qh5 15. h3 Na6 16. Nb5 Bb8 17. b4 Nc7 18. Nxc7 Bxc7 19. Bb2 Qh6 20. a4 Rac8 21. a5 Ba8 22. Qe2 Nd5 23. Bd4 Bb8 24. Rb3 f5 25. b5 g5 26. Ne5 f4 27. Ng4 Qh4 28. Qb2 f3 29. Be4 Nf4 30. exf4 Bxe4 31. fxg5 Rf4 32. Nh6+ Kf8 33. Bc5+ Rxc5 34. Qh8+ Ke7 35. Qg7+ Kd6 36. Rd1+ Bd5 37. Nf7+ Rxf7 38. Qxf7 Qxg5 39. Qf8+ Ke5 40. Re3+ Be4 41. Qxc5+ d5 42. g3 Qg6 43. Rd4 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.26"]
[Round "8"]
[White "Heaven, Peter"]
[Black "Lasar, Yves"]
[Result "1-0"]
[ECO "C14"]
[PlyCount "81"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 0-0 8. Nf3 c5 9. Bd3 cxd4 10. Nb5 a6 11. Nbxd4 f5 12. exf6 Nxf6 13. 0-0 Nc6 14. Qe2 Re8 15. Rae1 Bd7 16. c3 Qc5 17. Qf2 Re7 18. Qh4 Rae8 19. Kh1 Qd6 20. Rf2 Rf8 21. Ne5 Nxd4 22. cxd4 Qb4 23. Rf3 Be8 24. Rfe3 Qd6 25. Rh3 g6 26. Qg5 Rg7 27. Rhe3 Nh5 28. g3 Qe7 29. Nf3 Rf6 30. Qe5 Qf8 31. Rc1 Re7 32. Rc8 Qg7 33. Bf1 Rf8 34. Bg2 Nf6 35. Ng5 Bd7 36. Rxf8+ Qxf8 37. Qd6 Ne8 38. Qe5 Qf6 39. Bxd5 Qxe5 40. Rxe5 Bc6 41. Bxc6 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.25"]
[Round "7"]
[White "Krewi, Nasser"]
[Black "Lasar, Yves"]
[Result "1/2-1/2"]
[ECO "D38"]
[PlyCount "55"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bd2 d5 5. cxd5 exd5 6. Nf3 Nc6 7. e3 0-0 8. Bd3 Bg4 9. h3 Bh5 10. a3 Bd6 11. Be2 Re8 12. 0-0 a6 13. Rc1 Ne7 14. Qc2 c6 15. Na4 Ne4 16. Nc5 Nxd2 17. Qxd2 Qc7 18. Qc2 Bg6 19. Bd3 Bxd3 20. Qxd3 Ng6 21. Rfe1 Re7 22. e4 Bf4 23. Rc2 dxe4 24. Rxe4 Rae8 25. Rce2 Bd6 26. Rxe7 Rxe7 27. Rxe7 Qxe7 28. Qe3 1/2-1/2

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.23"]
[Round "6"]
[White "Lasar, Yves"]
[Black "Castaneda, Blas"]
[Result "1/2-1/2"]
[ECO "D86"]
[PlyCount "83"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bc4 0-0 8. Ne2 Qd7 9. 0-0 b6 10. Be3 Bb7 11. Qc2 c5 12. Rfd1 cxd4 13. cxd4 Nc6 14. Rac1 Rac8 15. Qd3 e6 16. a3 Qe7 17. Ba6 Rfd8 18. Bxb7 Qxb7 19. Bg5 Rd7 20. Qe3 b5 21. e5 Na5 22. Rxc8+ Qxc8 23. Rc1 Rc7 24. Rxc7 Qxc7 25. Qf3 Qc6 26. Qxc6 Nxc6 27. Bc1 Kf8 28. f4 Ke8 29. Kf2 Bf8 30. Ke3 b4 31. axb4 Nxb4 32. Nc3 Nc2+ 33. Ke4 a5 34. g4 Bb4 35. Na4 Na3 36. d5 exd5+ 37. Kxd5 Nb5 38. f5 Nc3+ 39. Nxc3 Bxc3 40. Ba3 Bd2 41. h3 Be1 42. Bb2 1/2-1/2

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.22"]
[Round "5"]
[White "Arosemena Torrijos, Franklin Alberto"]
[Black "Lasar, Yves"]
[Result "0-1"]
[ECO "C11"]
[PlyCount "104"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Nf3 c5 6. Be3 Nc6 7. Nb5 cxd4 8. Bg5 Qb6 9. a3 a6 10. Nbxd4 Nxd4 11. Nxd4 Qxb2 12. Be2 Qc3+ 13. Kf1 Nxe5 14. Nf3 Nxf3 15. gxf3 Bc5 16. Bd3 Bd7 17. Kg2 Bc6 18. h4 h6 19. Bd2 Qf6 20. Qe2 Bd6 21. Rag1 Qe5 22. Qxe5 Bxe5 23. Kf1 Rc8 24. f4 Bf6 25. Rh3 Ba4 26. f5 e5 27. c3 e4 28. Be2 Bd7 29. Re3 Bxh4 30. Rxg7 Bg5 31. Bh5 Rf8 32. f4 Bxf4 33. Re2 Bxd2 34. Rxd2 Rc5 35. f6 Be6 36. Rg3 Kd7 37. Bd1 Rfc8 38. Rc2 b5 39. Be2 d4 40. Rd2 d3 41. Kf2 Rxc3 42. Ke3 Rc2 43. Bd1 Rxd2 44. Kxd2 Kd6 45. Ke3 Ke5 46. Bh5 Rd8 47. Rg1 d2 48. Bd1 Rd3+ 49. Ke2 Bc4 50. Rg2 Rg3+ 51. Kf2 Rxg2+ 52. Kxg2 Kf4 0-1

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.21"]
[Round "4"]
[White "Norgaard, Jesper"]
[Black "Lasar, Yves"]
[Result "1-0"]
[ECO "C06"]
[PlyCount "103"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. c3 c5 6. Bd3 Nc6 7. Ne2 cxd4 8. cxd4 Qb6 9. Nf3 f6 10. exf6 Nxf6 11. 0-0 Bd6 12. Nc3 0-0 13. Be3 Bd7 14. Rc1 Rae8 15. a3 a6 16. h3 Qd8 17. Na4 Re7 18. Nc5 Be8 19. b4 Bb8 20. Qc2 Qd6 21. Rfe1 Kh8 22. g3 Nh5 23. Ne5 h6 24. Ng6+ Bxg6 25. Bxg6 Nf6 26. Nxb7 Rxb7 27. Qxc6 Rb6 28. Qxd6 Bxd6 29. Bd2 Bb8 30. Re3 Ng8 31. Rec3 Ne7 32. Bd3 g5 33. Kg2 Kg7 34. Rb3 Bd6 35. Rcb1 Rfb8 36. R3b2 Nc6 37. Bc3 Ne7 38. a4 Rc8 39. Rb3 Rcb8 40. b5 axb5 41. Rxb5 Bc7 42. a5 Rxb5 43. Rxb5 Kf7 44. Kf3 Nc8 45. Bb4 Na7 46. Rxb8 Bxb8 47. Bc5 Nc6 48. a6 e5 49. dxe5 Nxe5+ 50. Ke3 Nc6 51. Bb5 Na7 52. Bd7 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.20"]
[Round "3"]
[White "Lasar, Yves"]
[Black "Kumar Singh, Promod"]
[Result "1-0"]
[ECO "A42"]
[PlyCount "79"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 c6 5. Be3 Qa5 6. Qd2 Nd7 7. Nf3 h5 8. Bd3 Ngf6 9. h3 a6 10. a3 Qc7 11. Rc1 e5 12. dxe5 dxe5 13. c5 0-0 14. Bc4 a5 15. 0-0 a4 16. Rfd1 Ne8 17. Qc2 Qa5 18. Na2 Bf6 19. Nb4 Kg7 20. Ba2 Rh8 21. Qc4 Rf8 22. g4 hxg4 23. hxg4 Be7 24. Kg2 Ndf6 25. Nxe5 Nxg4 26. Nxg4 Bxg4 27. Rh1 Bh5 28. Nd3 Qc7 29. Nf4 Nf6 30. Qxf7+ Rxf7 31. Ne6+ Kh7 32. Nxc7 Raf8 33. Ne6 Nxe4 34. Nxf8+ Rxf8 35. Rxh5+ gxh5 36. Bb1 Bf6 37. Bxe4+ Kh8 38. Rc4 Rg8+ 39. Kh3 Bxb2 40. Rxa4 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.19"]
[Round "2"]
[White "Huergo, Jose Ramon"]
[Black "Lasar, Yves"]
[Result "1-0"]
[ECO "C06"]
[PlyCount "93"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 cxd4 8. cxd4 Qb6 9. Nf3 f6 10. exf6 Nxf6 11. 0-0 Bd6 12. Nc3 a6 13. a3 Bd7 14. Bg5 0-0 15. b4 Qa7 16. Rc1 b5 17. Bb1 Rf7 18. Qd3 Raf8 19. Bh4 Bf4 20. Rce1 Qc7 21. Re2 Ne7 22. Ne5 Bxe5 23. dxe5 Ne4 24. Bxe7 Rxe7 25. Nxd5 exd5 26. Qxd5+ Be6 27. Qxe4 Bf5 28. Qe3 Bg4 29. Ba2+ Kh8 30. f3 Bd7 31. Rc1 Qb7 32. Rc5 Rfe8 33. Qe4 Qb6 34. Bb1 g6 35. Qd4 Be6 36. Bc2 Rd7 37. Qe3 Red8 38. Rc3 Qb8 39. Rd3 Bc4 40. Rxd7 Rxd7 41. Re1 Qd8 42. h3 Rd2 43. Be4 Rb2 44. e6 Rb3 45. Qc5 Qf6 46. e7 Bf7 47. Qc8+ 1-0

[Event "World U20-ch20"]
[Site "Mexico City"]
[Date "1981.08.18"]
[Round "1"]
[White "Lasar, Yves"]
[Black "Milos, Gilberto"]
[Result "0-1"]
[ECO "E54"]
[PlyCount "82"]
[EventDate "1981.08.18"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "MEX"]
[SourceTitle "EXT 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.06"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.06"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Bd3 d5 6. Nf3 c5 7. 0-0 b6 8. a3 dxc4 9. Bxc4 cxd4 10. exd4 Bxc3 11. bxc3 Qc7 12. Qe2 Nbd7 13. Bb2 Bb7 14. Bd3 Nd5 15. Qe4 N7f6 16. Qe5 Rac8 17. Rfc1 Nf4 18. Bf1 Nh3+ 19. gxh3 Bxf3 20. Ba6 Bb7 21. Bxb7 Qxb7 22. c4 Qe4 23. Qxe4 Nxe4 24. Rc2 Rc6 25. Rac1 Rfc8 26. a4 Nd6 27. c5 Nf5 28. Kg2 Kf8 29. Ba3 Ke8 30. cxb6 Ne3+ 31. fxe3 Rxc2+ 32. Rxc2 Rxc2+ 33. Kg3 axb6 34. Bd6 Ra2 35. Bc7 Rb2 36. a5 b5 37. Bd6 Ra2 38. Bb4 Ra4 39. Bd2 b4 40. Kf3 b3 41. Bc3 Rxa5 0-1

